<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * MySQLi Utility Class
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_utility extends CI_DB_utility {

	/**
	 * List databases
	 *
	 * @access	private
	 * @return	bool
	 */
	function _list_databases()
	{
		return "SHOW DATABASES";
	}

	// --------------------------------------------------------------------

	/**
	 * Optimize table query
	 *
	 * Generates a platform-specific query so that a table can be optimized
	 *
	 * @access	private
	 * @param	string	the table name
	 * @return	object
	 */
	function _optimize_table($table)
	{
		return "OPTIMIZE TABLE ".$this->db->_escape_identifiers($table);
	}

	// --------------------------------------------------------------------

	/**
	 * Repair table query
	 *
	 * Generates a platform-specific query so that a table can be repaired
	 *
	 * @access	private
	 * @param	string	the table name
	 * @return	object
	 */
	function _repair_table($table)
	{
		return "REPAIR TABLE ".$this->db->_escape_identifiers($table);
	}

	// --------------------------------------------------------------------

	/**
	 * MySQLi Export
	 *
	 * @access	private
	 * @param	array	Preferences
	 * @return	mixed
	 */
	function _backup($params = array())
 {
/*
  // Currently unsupported
  return $this->db->display_error('db_unsuported_feature');
*/
  if (count($params) == 0)
  {
   return FALSE;
  }

  // Extract the prefs for simplicity
  extract($params);

  // Build the output
  $output = '';
  foreach ((array)$tables as $table)
  {
   // Is the table in the "ignore" list?
   if (in_array($table, (array)$ignore, TRUE))
   {
    continue;
   }

   // Get the table schema
   $query = $this->db->query("SHOW CREATE TABLE `".$this->db->database.'`.`'.$table.'`');

   // No result means the table name was invalid
   if ($query === FALSE)
   {
    continue;
   }

   // Write out the table schema
   $output .= '#'.$newline.'# TABLE STRUCTURE FOR: '.$table.$newline.'#'.$newline.$newline;

   if ($add_drop == TRUE)
   {
    $output .= 'DROP TABLE IF EXISTS '.$table.';'.$newline.$newline;
   }

   $i = 0;
   $result = $query->result_array();
   foreach ($result[0] as $val)
   {
    if ($i++ % 2)
    {
     $output .= $val.';'.$newline.$newline;
    }
   }

   // If inserts are not needed we're done...
   if ($add_insert == FALSE)
   {
    continue;
   }

   // Grab all the data from the current table
   $query = $this->db->query("SELECT * FROM $table");

   if ($query->num_rows() == 0)
   {
    continue;
   }

   // Fetch the field names.
   // We are going to surround all values with single quotes
   // and hope that mysql would be able to make type conversion...
   $field_str = '';
   foreach ($query->row() as $field_name => $field_value) $field_str .= '`'.$field_name.'`, ';

   // Trim off the end comma
   $field_str = preg_replace( "/, $/" , "" , $field_str);

   // Build the insert string
   foreach ($query->result_array() as $row)   
   {
    $val_str = '';

    $i = 0;
    foreach ($row as $v)
    {
     // Is the value NULL?
     if ($v === NULL)
     {
      $val_str .= 'NULL';
     }
     else
     {
      $val_str .= $this->db->escape($v);
     }

     // Append a comma
     $val_str .= ', ';
     $i++;
    }

    // Remove the comma at the end of the string
    $val_str = preg_replace( "/, $/" , "" , $val_str);

    // Build the INSERT string
    $output .= 'INSERT INTO '.$table.' ('.$field_str.') VALUES ('.$val_str.');'.$newline;
   }

   $output .= $newline.$newline;
  }

  return $output;
 } 
}

/* End of file mysqli_utility.php */
/* Location: ./system/database/drivers/mysqli/mysqli_utility.php */